Grill Master offers contract GM205, which is comprised of a free-standing gas grill for small patio use plus installation to a customers gas line for a total price $800. On a standalone basis, the grill sells for $700 (cost $425), and Grill Master estimates that the standalone selling price of the installation service (based on cost-plus estimation) is $150. (The selling of the grill and the installation services should be considered two performance obligations.) Grill Master signed 10 GM205 contracts on April 20, 2017, and customers paid the contract price in cash. The grills were delivered and installed on May 15, 2017. Prepare journal entries for Grill Master for GM205 in April and May 2017.